Farmers and consumers need healthy plants and quality plant derived products for consumption. Efforts to improve plant health have been evolving with increased understanding of plant ecology and pest management.
In spite of success in controlling the crop pests, pesticides adversely affect public health and environment. Residues of pesticides in food crops often been reported to exceed their acceptable limits. Many new pests which were controlled by their natural enemies present in the ecosystems have assumed the status of the major pests in some regions due to decline in the population of the natural enemies caused by the indiscriminate and excessive use of pesticides.